Combined oral contraceptive use before the first birth and epithelial ovarian cancer risk.

Abstract:

BACKGROUND:Combined oral contraceptive (COC) use reduces epithelial ovarian cancer (EOC) risk. However, little is known about risk with COC use before the first full-term pregnancy (FFTP). METHODS:This Canadian population-based case-control study (2001-2012) included 854 invasive cases/2139 controls aged ⩾40 years who were parous and had information on COC use. We estimated odds ratios (aORs) and 95% confidence intervals (CI) adjusted for study site, age, parity, breastfeeding, age at FFTP, familial breast/ovarian cancer, tubal ligation, and body mass. RESULTS:Among parous women, per year of COC use exclusively before the FFTP was associated with a 9% risk reduction (95% CI=0.86-0.96). Results were similar for high-grade serous and endometrioid/clear cell EOC. In contrast, per year of use exclusively after the FFTP was not associated with risk (aOR=0.98, 95% CI=0.95-1.02). CONCLUSIONS:Combined oral contraceptive use before the FFTP may provide a risk reduction that remains for many years, informing possible prevention strategies.

journal_name

Br J Cancer

authors

Cook LS,Pestak CR,Leung AC,Steed H,Nation J,Swenerton K,Gallagher R,Magliocco A,Köbel M,Brooks-Wilson A,Le N

doi

10.1038/bjc.2016.400

subject

Has Abstract

pub_date

2017-01-17 00:00:00

pages

265-269

issue

2

eissn

0007-0920

issn

1532-1827

pii

bjc2016400

journal_volume

116

pub_type

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